Adjustable square



Patented Sept. 11, 1923.

UNETED STATES tra nee PERCY VICTOR LORD, OF BEXLEY, ENGLAND.

ADJUS LE SQUARE.

Application filed January 17, 1921. Serial No. 437,986.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH '3, 1921, 41 STAT. 1;, 1313.) 7

To all whom it may concern:

Be it known that L-Pnitor VICTOR LORD, of Tresco, Knoll Road, Bexley, in the county of Kent, England, have invented certain new and useful Improvements in, or Relating to Adjustable Squares, for which I have filed application in England Februar 15, 1919, Patent No. 143,294, and of which the following is a specification.

This invention relates to instruments of the kind commonly known as engineers squares in which the lighter member or blade can be moved relatively to a base or butt portion to enable the, instrument to be adapted for use on objects of various length, the chief object of the invention being to provide a square of this character which can be easily and accurately made and which can be readily adjusted and the accuracy of its adjustment preserved even after long and continued use.

According to this invention, the lighter member or blade is provided with a number of utilizable faces or edges preferably four, of appropriate length and construction for enabling the instrument to be applied to the sides of narrow slots or other parts inaccessible to the ordinary type of square,

the said faces or edges being all similar so as to also afford reserve faces or edges which can be brought into. working or operative position as required, whereby the durability of the instrument can be greatly increased. A clamping or locking device is also provided to hold the blade to thebutt portion in such a manner that no side or unsymmetrical strains are caused in either of these parts when they are clamped together, and that the blade is held centrally on the butt portion irrespective of the form of the contacting surfaces, the several parts being so constructed and arranged that all the surfaces are easily accessible, thus greatly facilitating inspection and cleaning.

In order that the said invention may be clearly understood and readily carried into effect the same will now be described more fully with reference to the accompanying drawings, in which Figure 1 is a side elevation and Figure 2 an end elevation of an adjustable square embodying the invention.

Figure 3 is a verticalsection taken at right angles to Figure 1.

(t denotes the lighter member orblade and Z) the base'or butt portion. The blade w is shown provided with four faces or edges which are all similar and afford reserve faces or edges which can be brought into working or operative position as required. The said blade is adapted to be held to the buttportion Z) by means of a clamping or locking device comprising a locking bolt 0 extending through the butt portion 6 and having at its inner end a head at engaging with the blade and being screw threaded at its outer end to receive a clamping-nut c. This nut operates to draw the said locking .bolt through the butt portion 1) against the resistance of a spring 7, thereby binding the blade at against the end of the butt portion and clamping these parts together in the desired position with respect to each other. In order to obtain the four surfaces on the blade as aforesaid, thesaid blade is made, as shown, of square formation in cross section with rectangularly shaped grooves 9 extending alongthe middle of each side to form an undercut ridge h at each corner. The blade is mounted on the butt portion in such a position that any'two of the said ridges it can be caused to lie opposite each other in aplane containing the axis of the locking bolt. The head (Z of the said locking bolt may be of a shape such' as that indi: catedmore particularly in Figure 3, so as to engage with any one of the ridges lying adjacent thereto. The end 2' of the butt portion which makes contact with the blade has a V shaped seating to correspond with the blade as shown in Figure 2. The butt portion shown is of rectangular formation in crosssection, the part thereof which is of lesser dimension being disposed transversely to the blade at and somewhat smaller than the disspring f serves to maintain the clamping nut of the lockingbolt 0 against its seating atthe outer end 7' of the butt portion when the blade a is removed for cleaning, whilst also enabling the inner end or head (Z of the locking bolt to occupy such a position as to permit of the blade being readily reassembled on the butt portion.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. In an adjustable square, a stock, a blade having the shape of an equilateral polygon in cross section provided with a groove in each of its side faces, and means selectively engageable with any two of the grooves in the adjacent side faces and coacting therewith to adjustably clamp the blade in position upon the stock.

2. In an adjustable square, a stock, a blade having the shape of an equilateral polygon in cross section and provided with a plurality of grooved faces and longitudinal corners adapted for selective use, and means selectively engageable with any two adjacent grooved faces of the blade to clamp the latter in adjusted position relative to the stock.

3. In an adjustable square, a stock, a

' blade, means for clamping the blade in position upon the stock, and means normally acting in opposition to the first mentioned means tending to disengage the stock from the blade.

41-. In an adjustable square, a stock, a blade, means for clamping said blade against said stock including an adjustable clamping element, and means normally acting in opposition to the first mentioned means tending to disengage the blade from the stock.

5. In an adjustable square, a stock having a recessed terminal, a blade polygonal in cross section arranged to have any one of its several longitudinal corners mounted for sliding movement in the recessed terminal of the stock, means to clamp the blade in position upon the stock, and means acting in 0pposition to the clamping means tending to disengage the blade from the stock 6. In an adjustable square, a stock, a blade having one of its corners engaged with the stock, and a blade embracing member arranged wholly within the stock for drawing the corner of the blade against the terminal of the stock.

7. In an adjustable square, a stock, a blade having its several longitudinal corners selectively engageable with the terminal of the stock, and a blade embracing member coacting with a single corner of the blade for drawing the latter against the terminal of the stock.

8. In an adjustable square, a stock, a blade having a plurality of longitudinal cor ners selectively engageable with a terminal of the stock, and a blade embracing member arranged wholly within the stock and coacting with a single longitudinal corner of the blade for drawing and clamping the latter against the terminal of the stock.

9. In an adjust-able square, a stock, a blade having a plurality of longitudinal corners selectively engageable with one terminal of the stock, a blade embracing member arranged wholly within the stock for drawing the corner of the blade against the terminal of the stock, and means normally tending to disengage the blade from the stock.

10. In an adjustable square, a stock, a blade having a plurality'of longitudinal corners selectively engageable with one terminal of the stock, a blade embracing member arranged wholly within the stock for drawing the blade against the terminal of said stock, and an exposed adjusting member for the embracing member arranged at the terminal of the stock opposite the blade.

In testimony whereof I have signed my name to this specification.

PERCY VICTOR LORD. 

